if I understand you correctly, this sounds like an issue I am facing and this is what I am experiencing and maybe that can be of help. My site is real estate related.
Page 1 title tag: "City Homes for Sale" (page I want to rank for)
Page 2 title tag: "City Home Picture Gallery" (lots of original pictures and videos I want G to index in order to increase the amount of unique content from my site G is indexing, but I don't care much for - more a page for users to see beautiful pictures)
Unfortunately, when users search for "city homes for sale" on search engines, often this Page 2 type will show (I have a lot of Page 2 types for various neighborhoods). I guess because Page 2 has more unique content it ranks well, also because it uses words "City" and "home" in title tag. I have now taken the word "Home" out of title tag and I look forward to see if it helps. Not just in terms of dropping ranking for Page 2 (which would be great), but more importantly will search engines be able to get the point that Page 1 is the relevant page. I am interlinking from Page 2 to Page 1 in a logical way with appropriate keywords. It should be crystal clear, but our supposed super smart / advanced search engines do not seem to get it.
Conclusion: As a smaller / less authoritative website, I would definitely be very careful with keyword selection in title tag, as my site has proven that it can work against you. Large powerful websites can get away with more of this I believe and search engines seem to understand them much better. Therefore, I find with SEO advice it is so important to consider if the perspective is in comparison to similar authority websites.